Posted February 19, 2012
This GameSpy preview gets very interesting in the last paragraph:
Second, Rebellion will have full Steamworks integration for multiplayer and achievements -- a huge improvement over vanilla Sins' system. Because of Sins' rich modding community, Fraser says Ironclad is definitely interested in getting Steam Workshop set up, though there are certain technical hurdles that might prevent it from happening, so he wasn't able to make any promises during this demo.
Considering AFAIK Stardock is still serving publisher duty for this game, I can't help but think this is a massive U-turn from their "we don't want anything to do with Steam" policy pre-GameStop.